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2008 ICD-9-CM Volume 1 Diagnosis Codes Home > Neoplasms 140-239 > Malignant Neoplasm Of Respiratory And Intrathoracic Organs 160-165 > Malignant Neoplasm Of Thymus Heart And Mediastinum 164.* > 2008 ICD-9-CM Diagnosis 164.9 Malignant neoplasm of mediastinum part unspecified 164.9 is a specific code that can be used to specify a diagnosis View the ICD-9-CM Volume 1 164.* hierarchy